CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net revenue	$ 14,656	$ 12,094
Cost of revenue	4,001	3,175
Gross profit	10,655	8,919
Operating expenses:
Sales and marketing	6,547	6,079
General and administrative	5,612	6,017
Research and development	1,213	1,218
Total operating expenses	13,372	13,314
Operating loss	(2,717)	(4,395)
Other expenses:
Interest expense, net	303	552
Other expense (income)	0	53
Total other expenses	303	605
Net loss	$ (3,020)	$ (5,000)
Weighted average common shares - basic and diluted (in shares)	14,367,056	12,073,776
Net loss per share attributable to common stockholders - basic and diluted (in dollars per share)	$ (0.21)	$ (0.41)